Competition head porting

[83 crew cab]

anybody got any flow numbers out there they would like to share so that when I get on the flow bench next week I can tell if I am in the ball park #ad

 

[HVAC]

Take the figures for a 24v head and divide by two:-laf :-laf :-laf

 

[83 crew cab]

man I never thought of that

 

[keimmmo]

Looks like you have opened the port quite a bit. Good for the flow... just make sure the gasket isn't smaller than your new improved port. Also, make sure the exhaust manifold is as big or bigger than the port. No point in having a great flowing head and stuffing a cork in it with mismatched runners!!!



Are you an experienced head porter or is this a first attempt? I port a lot of heads with good results if you are looking for any tips.



Steve

 

[83 crew cab]

thanks steve I have done some gasser stuff. gasket area should be ok thats ported to the carben stain. I will have gasket this week to finish. the manifold is an ats but it still needs some work

 

[HoleshotHolset]

Lookin' good George... .



Most forced induction engines (diesel included) benefit most from bowl area and short-side radius work.



All I have ported is intake manifolds... I never got the guts to ruin a perfectly good head all by myself.



Matt

 

[TxDieselKid]

Originally posted by HoleshotHolset

I never got the guts to ruin a perfectly good head all by myself.



Matt

But putting a single stack on is different right?

 

[83 crew cab]

thanks Matt I know what you mean I swore I would never port another set of heads but I could not justify the cost on these I dont see that much that you can do with them and its only 6 cylinders



TDK whats wrong with only one stake

 

[TxDieselKid]

Originally posted by 83 crew cab

TDK whats wrong with only one stake

When it's name is Stakeman, everthing!!!

 

[83 crew cab]

man I hate it when I dont read before I his enter susposed to stack :{

 

[J.R. Adkins]

Do you have base line #'s?





J. R.

 

[83 crew cab]

I will I am leaving one cylinder stock till I get back from the flow bench hopfuly sometime next week

 

[HoleshotHolset]

Drew:



My truck still runs with a 6" hole in the bed and the leftover brackets for the stack. If you goof up a port job while messing around in the bowl area and nick a valve seat... . then you'll be wishing you never started.



Besides... . the hole in the bed helps the melted snow drain out better! :-laf



Matt

 

[83 crew cab]

back from the speed shop here is the ported numbers we got



lift cc



. 400 181. 3

. 350 175

. 300 159

. 250 137

. 200 114. 7

. 150 . 93

. 100 . 65

 

[83 crew cab]

opps forgot to post the stock numbers



lift cc

. 400 134

. 350 128. 6

. 300 123

. 250 111. 6

. 200 96

 

[Steve Campbell]

It has been a long time since I was in the competition end of things......

..... but a 35% gain is pretty good in my book. Thanks for the post.

 

[Sled Puller]

Do you have any figures on how much quicker it will crack with all that material gone?

 

[83 crew cab]

I know one thing Gene I sure would not use them on a truck pulling a load up a steep hill at 1700



thanks Steve

 

[Steve Campbell]

So the general consesus is....

it is OK to head port for decreased EGT if racing, but not to decrease EGT for towing



I thought, looking at the picture on Piers site, that porting was "safe" if one paid careful attention to the "caution" areas. Perhaps I should not have stuck my toe into something I don't know much about.



I am curious, though, as I was thinking I might try the head porting in a couple of years. I only use my truck for towing.

 

[83 crew cab]

steve no it fine to port for towing also but I went a little bigger on the exit side than the pics on piers shows so I may be mor prone to crack in some spots but I dont even thank its that thin to give any real problems but I guess I will find out



I thank Gene is poking fun more than anything George